I have only been here 1 season so far. I suspect no one has replied because it is a touchy area. I know when I drove down from Nogales, I had to buy a "sticker" for my Jeep for the 180 day tourista visa. I also had to give a sizeable deposit on my credit card to ensure my vehicle would cross back over the border before the visa expires...otherwise you forfeit the deposit. Now that I have obtained my FM3 I plan to leave my vehicle here permanently next season, but will drive it home this time. I am sure someone on this site can give you more information than that, but I am fairly sure you can't leave your car and boat here for a year (legally) with out an FM3. I hope this helps you.